分布式可再生能源发电系统研究

为研究太阳能、风力等可再生能源的互补发电,提出了基于直流总线的小规模分布式发电系统的实验平台。该平台由太阳能发电、风力发电、蓄电池、飞轮、公用电网并网和负载等6个单元构成。各单元仅通过直流总线联接,自主控制。发电系统可在独立和并网两种运行模式之间在线自动平滑切换。其中,风力、太阳能发电单元成功实现了最大功率点追踪控制,飞轮单元有效补偿了直流总线电压的高频波动,电池单元解决了负载和发电单元之间的电力供需矛盾,并网单元解决了负载和发电系统之间的电力供需矛盾。通过实验验证,该发电系统在两种运行模式以及在运行模式切换时均能稳定、可靠地工作,直流总线的电压稳定在325～375V之间。

Research on Distributed Renewable Energy Power System

An experimental platform of DC bus based small-scale distributed pow er system is proposed in this paper to study about complementary power generatio n with renewable energy such as photovoltaic and wind energy.Six units such as s olar generation, wind generation,battery,flywheel,grid-connected inverter and load unit composed the platform. Each unit was independently controlled and connected only through DC bus.The power system could be operated both in stand -alone and grid-connected mode,and could be automatically switched between t he two modes.MPPT (Maximum Power Point Tracking) control was successfully impl emented with wind generation and photovoltaic unit.Flywheel unit compen-sated the high frequency of DC bus fluctuation.Battery unit resolved power supply and requirement conflict between gen-eration units and load.Grid-connected inver ter resolved conflict between load and the power system when the system is op- erated in grid-connected mode.Stability and reliability of the two operation m odes and the mode switch were verified by the experimental results.The fluctuati on of DC bus voltage is between 325V and 375V.